Democratic presidential candidate Sen. Barack Obama, D-Ill., left, talks to former President Bill Clinton after addressing supporters at a rally in Kissimmee, Fla., Wednesday, Oct. 29, 2008.
(AP Photo/Jae C. Hong)
Democratic presidential candidate Sen. Barack Obama, D-Ill., enters a rally with former president Bill Clinton at Osceola Heritage Park in Kissimmee, Fla., Wednesday, Oct. 29, 2008.
(AP Photo/Alex Brandon)
Democratic presidential candidate Sen. Barack Obama, D-Ill., left, speaks at a rally he attended with former President Bill Clinton in Kissimmee, Fla., Wednesday, Oct. 29, 2008.
(AP Photo/John Raoux)
Democratic presidential candidate Sen. Barack Obama, D-Ill., left, shakes hands with former President Bill Clinton at a rally in Kissimmee, Fla., Wednesday, Oct. 29, 2008.
(AP Photo/Jae C. Hong)
Democratic presidential candidate Sen. Barack Obama, D-Ill., left, and former President Bill Clinton wave at a rally in Kissimmee, Fla., Wednesday, Oct. 29, 2008.
(AP Photo/Jae C. Hong)
Democratic presidential candidate Sen. Barack Obama, D-Ill., left, waves as he arrives at a rally with former President Bill Clinton in Kissimmee, Fla., Wednesday, Oct. 29, 2008.
(AP Photo/John Raoux)
U.S. Democratic Presidential nominee Senator Barack Obama (D-IL) is joined by Senator Bill Nelson (L) (D-FL) and former President Bill Clinton (R) at a campaign rally in Kissimmee, Florida, October 29, 2008. The event is the first time Obama and Clinton have campaigned together in person. REUTERS/Kevin Kolczynski
Democratic presidential candidate Sen. Barack Obama, D-Ill., left, shakes hands with supporters with former President Bill Clinton at a rally at Osceola Heritage Park in Kissimmee, Fla., Wednesday, Oct. 29, 2008.
(AP Photo/Jae C. Hong)
U.S. Democratic Presidential nominee Sen. Barack Obama (D-IL) embraces former President Bill Clinton (R) after he was introduced at a campaign rally, marking the first time they have campaigned together, in Kissimmee, Florida, October 29, 2008. REUTERS/Kevin Kolczynski
Democratic presidential candidate Sen. Barack Obama, D-Ill., listens as former president Bill Clinton speaks at a rally at Osceola Heritage Park in Kissimmee, Fla., Wednesday, Oct. 29, 2008.
(AP Photo/Jae C. Hong)
U.S. Democratic Presidential nominee Sen. Barack Obama (D-IL) (R) listens as he is endorsed by former President Bill Clinton at a campaign rally in Kissimmee, Florida, October 29, 2008. REUTERS/Kevin Kolczynski
Democratic presidential candidate Sen. Barack Obama, D-Ill., left, stands with former President Bill Clinton at a rally at Osceola Heritage Park in Kissimmee, Fla., Wednesday, Oct. 29, 2008.
(AP Photo/Jae C. Hong)